Fix build on OpenBSD

Signed-off-by: Adrien Gallouët <adrien@gallouet.fr>

src/common.h

@@ -12,6 +12,8 @@
 #include <errno.h>
 
 #include <arpa/inet.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
 
 #ifndef PACKAGE_NAME
 #define PACKAGE_NAME "glorytun"

src/tun.c

@@ -138,7 +138,7 @@ tun_create_by_name(char *name, size_t len, const char *dev_name)
         return -1;
     }
 
-    return open(tmp, O_RDWR);
+    return open(name, O_RDWR);
 }
 
 #endif /* not __APPLE__ */